Selecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame

Details Selecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame Selecting Highly-Compact Radio Sources for the Definition of the Celestial Reference Frame

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e...4c&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

The intrinsic radio structure of the extragalactic sources is one of the limiting errors in the definition of the celestial reference frame. Based on multi-epoch VLBI images obtained with the VLBA and other VLBI telescopes around the world between 1994 and 2005, we evaluate this effect for 557 ICRF sources (about 80% of the current frame) and calculate a so-called "structure index" to define the astrometric suitability of the sources. The structure index ranges from 1 for the most compact sources to 4 for the most extended sources. The number of epochs for which the structure index is available for a given source varies from 1 for the least-observed sources to 20 for the intensively-observed sources. From this calculation, we identify a subset of 242 ICRF sources which have very good or good astrometric suitability (i.e a structure index of either 1 or 2) at any of the available epochs. We argue that these compact sources are potential candidates for defining the celestial frame with the highest accuracy when a future realization of the ICRF is made.

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